The Hummer Alpha is a variation of the H1 and contains the re-engineered GM Duramax engine. It featured a five-speed transmission and replaced the turbo-diesel which had sluggish sales in the market. One of the reasons why the vehicle was re-engineered was due to the lack of power. This led to a decrease in sales, eventually the Hummer Alpha phased out the H1 demand. Other modifications to the Hummer Alpha included the use of high specific strength steel, powerful steering gears which were quieter, new induction system, and a high steel chassis frame.